Similar templates at English sister projects [edit]
wpd Wikipedia Void
cms Commons Void
wbk Wikibooks Void
wnw Wikinews void
wsp Wikispecies Void
wvy Wikiversity Void

This template does nothing.
More exactly, it outputs the null string. It's useful for programming advanced templates.

It often is used within a template to the right of an equals sign.

Alternatives

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It's also possible to use {{ns:0}} instead of {{void}}. Attackers could manipulate {{void}} but not {{ ns:0 }}, the empty/void/null string for the main namespace. Some magic words like __END__ might also have the desired effect of doing nothing.